Besides three nice rooms, the Pensão Sitaquario offers excellent food and is definitely the best restaurant on the island (and maybe on Cape Verde).
The owner Henny Kuster used to work as a cook in Holland and is now transferring his knowhow to local youth. The speciality of the house is tuna, but you can get almost anything you want, even a Swiss Roesti. And it's really up to you - you should order your dinner a few hours before (unless you're staying there also, then you'll be asked anyway since dinner is included).
Don't expect a fancy setting, but rather a very family-like atmosphere and interesting conversations during and after dinner with a glass of wine.
Favorite Dish: Tuna is the speciality of the house and excellent in all variations.
Opposite Ribeira Brava's old town hall and overlooking the town's only oasis of green, you can recover from the heat here, have a drink and play pool of futbolin with the locals.
Owned by Ney, a very friendly and helpful guy.
Medical infrastructure on Sâo Nicolau is very basic. There is a "centro de saúde" in Tarrafal and a small hospital in Vila da Ribeira Brava. But both are only very modestly equiped and in case of a more serious injury you'll need to be transported to another island. There is also no suitable transportation for the injured and the bumpy roads add to the danger of further damage during transport. Be very careful when you go hiking and do not swim far from the beach - there are shark attacks sometimes.
Luggage and bags:
No fancy trolley, on the cobbled streets you can forget about that. Rather come with a large backpack and a smaller one for day excursions
Clothing/Shoes/Weather Gear: Hiking shoes, flipflops (no highheels - it's a pain on the irregularly cobbled streets!), a light jacket for hiking, bikini or swimmingbriefs, summer clothes
Toiletries and Medical Supplies: Is mostly available in shops and pharmacies if you really need something. Special medication might be a problem though and sun lotion is advisable to bring along too. And quality condoms.
Camping/Beach/Outdoor Gear: Beach towel for sure and other beach gear. Camping is not really popular